{"id":"CVE-2026-98868","title":"kernel: dm-pcache: reject a kset that overruns its segment (CVE-2026-98868)","summary":"A flaw was found in the Linux kernel's dm-pcache driver. A local attacker capable of presenting a crafted storage device with forged metadata can cause cache operations to exceed segment boundaries. This flaw triggers a kernel assertion fa…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-617","vendor":"Red Hat","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 01a700e9278da5706c865b9ca3ae70fdb7b4531d","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb","Linux 6.18"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T07:43:25+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98868"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555211"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98868"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98868"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98868.mbox"},{"url":"https://git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d"},{"url":"https://git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10"},{"url":"https://git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00169,"epssPercentile":0.06239,"ingestedAt":"2026-10-18T16:47:32.457Z","slug":"CVE-2026-98868","body":"## Overview\n\nA flaw was found in the Linux kernel's dm-pcache driver. A local attacker capable of presenting a crafted storage device with forged metadata can cause cache operations to exceed segment boundaries. This flaw triggers a kernel assertion failure, leading to a system crash and resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98868.json)\n\n**kernel: dm-pcache: reject a kset that overruns its segment** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228512,"id":"CVE-2026-98868","ts":1792844770788,"field":"cvss","old":null,"new":"4.4"},{"seq":228511,"id":"CVE-2026-98868","ts":1792844770788,"field":"severity","old":"none","new":"medium"}]}